Spring入门学习（使用XML配置文件方式来配置AOP） 第十七节

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xml配置文件配置AOP

1. 使用之前创建的类ArithmeticCalculator和ArithmeticCalculatorImpl
2. 去掉LoggingAspect和ValidationAspect类中的所有注解

   public class LoggingAspect {
   
   	public void beforeMethod(JoinPoint joinPoint) {
   		String methodName = joinPoint.getSignature().getName();
   		List<Object> args = Arrays.asList(joinPoint.getArgs());
   		System.out.println("The method " + methodName +" begins..." + args);
   	}
   	
   	public void afterMethod(JoinPoint joinPoint) {
   		String methodName = joinPoint.getSignature().getName();
   		System.out.println("The method "+methodName+" ends...");
   	}
   	
   	public void afterReturning(JoinPoint joinPoint, Object result){
   		String methodName = joinPoint.getSignature().getName();
   		System.out.println("The method "+methodName+ " ends with "+result);
   	}
   	
   	public void afterThrowing(JoinPoint joinPoint, Exception ex){
   		String methodName = joinPoint.getSignature().getName();
   		System.out.println("The method "+methodName+ " occurs exception: "+ex);
   	}
   	
   	/*
   	public Object aroundMethd(ProceedingJoinPoint pjd){
   		String methodName = pjd.getSignature().getName();
   		Object result = null;
   		try {
   			// 前置通知
   			System.out.println("The method "+methodName+ " begins");
   			result = pjd.proceed();
   			// 返回通知
   			System.out.println("The method "+methodName+" ends with "+result);
   		} catch (Throwable e) {
   			// 异常通知
   			System.out.println("The method "+methodName+ " occurs exception: "+e);
   			e.printStackTrace();
   		}
   		// 后置通知
   		System.out.println("The method "+methodName+ " ends ");
   		return result;
   	}*/
   }
   
   public class ValidationAspect {
   
   	public void validateArgs(JoinPoint joinPoint){
   		System.out.println("-->validate:"+Arrays.asList(joinPoint.getArgs()));
   	}
   }
   

3. 创建配置文件applicationContext-xml.xml如下：
   在配置文件中，使用<aop:config>来开始配置AOP，<aop:pointcut>配置切点表达式，<aop:aspect>配置切面及通知。

   <?xml version="1.0" encoding="UTF-8"?>
   <beans xmlns="http://www.springframework.org/schema/beans"
   	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   	xmlns:context="http://www.springframework.org/schema/context"
   	xmlns:aop="http://www.springframework.org/schema/aop"
   	xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd
   		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
   		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd">
   
   	<!-- 配置Bean -->
   	<bean id="calc" class="com.fafa.spring.aop.xml.ArithmeticCalculatorImpl"></bean>
   	
   	<!-- 配置切面的bean -->
   	<bean id="loggingAspect" class="com.fafa.spring.aop.xml.LoggingAspect"></bean>
   	<bean id="validationAspect" class="com.fafa.spring.aop.xml.ValidationAspect"></bean>
   	
   	<!-- 配置AOP -->
   	<aop:config>
   		<!-- 配置切点表达式 -->
   		<aop:pointcut expression="execution(* com.fafa.spring.aop.xml.*.*(..))" id="pointCut"/>
   		<!-- 配置切面及通知 -->
   		<aop:aspect ref="loggingAspect" order="2">
   			<aop:before method="beforeMethod" pointcut-ref="pointCut" />
   			<aop:after method="afterMethod" pointcut-ref="pointCut"/>
   			<aop:after-throwing method="afterThrowing" pointcut-ref="pointCut" throwing="ex"/>
   			<aop:after-returning method="afterReturning" pointcut-ref="pointCut" returning="return"/>
   			<!-- 
   			<aop:around method="aroundMethod" pointcut-ref="pointCut"/>
   			 -->
   		</aop:aspect>
   		<aop:aspect ref="validationAspect" order="1">
   			<aop:before method="validateArgs" pointcut-ref="pointCut"/>
   		</aop:aspect>
   	</aop:config>
   </beans>
   

4. 测试：

   public class Main {
   
   	public static void main(String[] args) {
   		ApplicationContext ctx = new ClassPathXmlApplicationContext("classpath*:applicationContext-xml.xml");
   		ArithmeticCalculator arithmeticCalculator = ctx.getBean(ArithmeticCalculator.class);
   		System.out.println(arithmeticCalculator.getClass().getName());
   		
   		int result = arithmeticCalculator.add(3, 6);
   		System.out.println("result:" + result);
   	
   		result = arithmeticCalculator.div(6, 3);
   		System.out.println("result:" + result);
   		
   //		result = arithmeticCalculator.div(6, 0);
   //		System.out.println("result:" + result);
   	}
   }
   

   测试结果：

   com.sun.proxy.$Proxy2
   -->validate:[3, 6]
   The method add begins...[3, 6]
   The method add ends...
   The method add ends with 9
   result:9
   -->validate:[6, 3]
   The method div begins...[6, 3]
   The method div ends...
   The method div ends with 2
   result:2